Update documentation for --filter CLI option (see #12260)

[gramsco]

Summary

This PR specifies how to use the filtering function CLI option. Previous documentation was slightly ambiguous as pointed out in the comments of #12260.

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[mrazauskas]

Good move. I think it would be useful to mention setup() hook as well. It was added in #8142. Can be done later as well.

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[SimenB]

thanks!

can you update all versions of the docs as well?

Also, run prettier over the file

[gramsco]

CLI.md * 😄

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